RU2013725C1 - Drying plant - Google Patents

Abstract

FIELD: drying of various articles. SUBSTANCE: plenum air ducts are shifted relative to each other in height of chamber. Nozzles on front panel of each air duct are mounted over concentric circles for angular displacement relative to front panel. Chamber is provided with air locks connected to its ends and brought in communication with each other through ventilation set by means of additional air ducts. Air locks may be made extensible. During operation of the plant, high turbulence of heat-transfer agent flow is ensured and heat absorbed by the article in course of drying is utilized. EFFECT: enhanced efficiency. 2 cl, 6 dwg

Description

 The invention relates to technical devices for drying and can be used for drying various products in engineering, chemical, food and other industries.

 A known drying installation comprising a drying chamber, a recirculation system of a drying agent with a distribution box located inside the drying chamber and having dispensing openings for a heat carrier, and a system for catalytic cleaning of gas emissions with a heat exchanger, which together with a gas exhaust pipe are located inside the distribution box.

 The disadvantage of this installation is the low efficiency of the drying process and the inefficiency of its operation. The first is due to the fact that the turbulence of the parallel stream jets emerging from the duct is low. In places of their frontal contact with the surface of the product, the drying process will go more intensively than in adjacent areas (between the jets). This cannot but affect the quality of the coating to be dried, its durability. The inefficiency is due to the fact that a significant part of the heat is spent on heating the product and this heat is uselessly lost when the product is removed from the drying chamber.

 A drying chamber is known, comprising a housing, a conveyor mounted on its arch, provided with a protective casing and carrying suspensions for the products to be dried, passing through a longitudinal slit made in the arch of the casing, communicating the cavities of the casing and the casing and having a thermal shutter, and supply air ducts with slotted nozzles, moreover nozzles are located on both sides of the gap with the formation of the last air-air injectors serving as a thermal shutter.

 This installation also has a number of significant drawbacks.

 Firstly, during conveyor drying, the ends of the chamber are open and the heat loss through them is many times higher than the heat loss through the longitudinal slot in the roof.

 Secondly, almost the same amount of heat is expended on heating the ejected air as what would be lost with a drying agent leaving through the gap. Ejected air reduces the temperature of the air in the chamber, and this (in order to withstand the required temperature conditions) requires the supply of a drying agent with a higher temperature to the chamber.

 As a result, energy costs increase.

 In addition, the intensity of the heat treatment of the product in this chamber is low and uneven on the surface, since the drying agent is supplied to the products in the form of parallel jets. Not used is the heat expended on heating products.

 The purpose of the invention is the intensification of the drying process and the reduction of energy consumption.

 To achieve this, in a drying installation containing a chamber and fresh air ducts with nozzles on the front panels located on opposite sides of the chamber, the fresh air ducts are displaced relative to each other along the height of the chamber, the nozzles of each of them are installed along concentric circles and with the possibility of angular movement relative to the front panel, and the camera is equipped with vestibules connected to its ends and communicated with each other by additional air ducts through the ventilation unit.

 This embodiment of the drying unit allows to intensify the drying process and reduce energy costs.

 The first is achieved due to the fact that the nozzles in the supply air ducts are installed in such a way that the outgoing jets of the drying agent form a vortex in the aggregate. If nozzles located in different concentric circles create vortices of different directions of rotation, then local vortices will also form in the zones between them. This will ensure highly turbulent movement (mixing) of the masses of the drying agent, the uniformity of the temperature field along the chamber and on the surface of the product, which is especially important when the product has a complex configuration. The height offset of oppositely installed supply ducts also contributes to this. Due to this, rotation of the vortex around the horizontal axis of the chamber is additionally achieved. The reduction of energy costs for the drying process is achieved by the fact that the heat absorbed by the product during its heating is partially used to preheat another product before it enters the drying chamber.

 In FIG. 1 shows a General view of the drying unit (in the plane of movement of the products); in FIG. 2 - the same, top view; in FIG. 3 is a view along arrow A in FIG. 2; in FIG. 4 is a section BB in FIG. 1; in FIG. 5 - sectional nozzle; in FIG. 6 is an embodiment of a drying chamber with partitions in the form of curtains.

 The nozzles 1 of the supply air ducts 2 and 3 are arranged in concentric circles with the possibility of angular movement relative to the front panel of the duct. Air ducts 2 and 3 are placed in the drying chamber 4, to the ends of which there are adjacent sliding vestibules 5 and 6 with collectors 7 and 8, which are connected to a blower (not shown) by means of corrugated hoses 9 and 10. Moreover, the hose 10 is discharge, and the hose 9 is suction. The collectors 7 and 8 have a perforation 11. Tambours 5 and 6 are connected from below by air ducts 12. Products 13, 14 and 15 are shown respectively in the inlet platform 5, the drying chamber 4 and the outlet platform 6. The tapering part 16 of the nozzle 1 is made in the ball 17 (spherical hinge), mounted to rotate in the front panel 18 of the ducts 2 and 3, and in the clamping flange 19. The drying chamber 4 can be made with end walls in the form of curtains 20 and 21 mounted on the cables 22.

 A drying unit operates as follows.

 The coolant, for example hot air supplied from a source (not shown) through ducts 2 and 3, exits through nozzles 1 into the drying chamber 4, forming concentric vortices and blowing the product 14. Due to the location of ducts 2 and 3 at different levels, vortex rotation is additionally created around the horizontal axis of the chamber 4. At this time, the curtains 20 and 21 are closed. During the drying of the product 14, air is circulated by another blower (not shown) between the tambours 5 and 6. By means of this blower, air is sucked from the tambour 5 through the hose 9 and fed to the manifold 8 through the hose 10, from where it enters the tambour 6 blowing hot product 15, has already passed drying, heats up and through the duct 12 enters the vestibule 5, giving up part of its heat to the product 13, which enters the dryer. Cooled air through the perforation 11 in the manifold 7 and the hose 9 enters the blower.

Claims (2)

 1. DRYING UNIT, containing a chamber and fresh air ducts with nozzles on the front panels, located on opposite sides of the chamber, characterized in that, in order to intensify the drying process and reduce energy consumption, the fresh air ducts are displaced relative to each other along the height of the chamber, and the nozzles each of them is installed in concentric circles and with the possibility of angular movement relative to the front panel, while the camera is equipped with vestibules connected to its ends and communicated between battle through the ventilation unit using additional air ducts.  2. Installation according to claim 1, characterized in that the vestibules are made sliding.

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